Analysis of Damage Self-Healing Performance of Basalt Fiber Asphalt Concrete at High-Cold and High-Altitude Area

Abstract

Abstract: In order to explore the self-healing properties of basalt fiber asphalt concrete under different damage levels, freeze-thaw cycles, and ultraviolet radiation aging, afour-point bending fatigue test and scanning electron microscope were used to analyzefrom macro and micro angles.By comparing and analyzing the fatigue damage rate v_D and the cumulative dissipated energy E_CD before and after the specimen healing, the corresponding healing coefficient R_HI was obtained respectively. The conclusion shows that basalt fiber has improved damage self-healing properties of ordinary matrix asphalt concrete, and the maximum value of the damage healing coefficient is 96%. Under the same environmental factors, the damage degree of the test piece is inversely proportional to the healing coefficient. At the same degree of damage, the freeze-thaw cycle has the greatest impact on the healing performance of the test piece, and the damage healing coefficient decreases by up to 4%. Cumulative dissipated energy can be used as an analysis index to more accurately characterize the damage self-healing performance of asphalt concrete.Through scanning electron microscopy image analysis, the mechanism of the effect of basalt fiber on the self-healing performance of asphalt concrete before and after ultraviolet and freeze-thaw action was further microscopically explained.

Key words: basalt fiber asphalt concrete, four-point bending fatigue test, damage healing property, cumulative dissipated energy, freeze-thaw cycle

CLC Number:

TU528

MA Haipeng, YU Pei. Analysis of Damage Self-Healing Performance of Basalt Fiber Asphalt Concrete at High-Cold and High-Altitude Area[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2803-2810.

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